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All Journal GEMA TEKNOLOGI METANA JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Waste Technology Jurnal Pengabdian Vokasi Bulletin of Chemical Reaction Engineering & Catalysis
Rizka Amalia
Chemical Engineering, Vocational School, Diponegoro University, Jl. Prof. Soedarto, Semarang 50275, Indonesia
Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Other

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Mass Transfer and Chemical Reaction Approach of the Kinetics of the Acetylation of Gadung Flour using Glacial Acetic Acid Andri Cahyo Kumoro; Rizka Amalia
Bulletin of Chemical Reaction Engineering & Catalysis 2015: BCREC Volume 10 Issue 1 Year 2015 (April 2015)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.10.1.7181.30-37

Abstract

Acetylation is one of the common methods of modifying starch properties by introducing acetil (CH3CO) groups to starch molecules at low temperatures. While most acetylation is conducted using starch as anhidroglucose source and acetic anhydride or vinyl acetate as nucleophilic agents, this work employ reactants, namely flour and glacial acetic acid. The purpose of this work are to study the effect of pH reaction and GAA/GF mass ratio on the rate of acetylation reaction and to determine its rate constants. The acetylation of gadung flour with glacial acetic acid in the presence of sodium hydroxide as a homogenous catalyst was studied at ambient temperature with pH ranging from 8-10 and different mass ratio of acetic acid : gadung flour (1:3; 1:4; and 1:5). It was found that increasing pH, lead to increase the degree of substitution, while increasing GAA/GF mass ratio caused such decreases in the degree of substitution, due to the hydrolysis of the acetylated starch. The desired starch acetylation reaction is accompanied by undesirable hydrolysis reaction of the acetylated starch after 40-50 minutes reaction time. Investigation of kinetics of the reaction observed that the value of mass transfer rate constant (Kcs) is smaller than the surface reaction rate constant (k). Thus, it can be concluded that rate controlling step is mass transfer. © 2015 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0)
Co-Authors Andri Cahyo Kumoro Anggun Puspitarini Siswanto Aprilia Larasati Dewi Aulia Windyandari B Budiyono Basa Ulina br Simalango Dina Elvia Rani Dwi Handayani Edy Supriyo Eflita Yohana Elin Siswati Fahmi Arifan Gina Novela Heny Kusuma Yanti Heny Kusumayanti Heny Kusumayanti Hermawan Dwi Ariyanto Ida Hayu Dwimawanti Ida Hayu Dwimawanti Ida Rahmawati Cahyaningsih Ifana Ifana Igin Ebeniene Rhamvy Ilyas Teguh Pangestu Maranatha Sembiring Mohamad Endy Y Yulianto Ni Putu Adeyani Nurul Pudiastutiningtyas Nurul Pudiastutiningtyas R.T.D Wisnu Broto Riris Yuliana Y.S. Vita Paramita Vynda Dindasari Siregar Wahyuningsih Wahyuningsih Wahyuningsih Wahyuningsih Wahyuningsih Wahyuningsih